Spline Curve Intersections Isoparametric Curve Exception

[rjc8237]

For some spline curves, the CvCvIntersector method is resulting the following exception GoTools/intersections/src/IsoparametricIntersectionCurve.C, line 97: Assertion 'ref_obj->numParams() == 2' failed. The curves where this is observed have regions that are nearly (but not exactly) overlapping.

The exception can be reproduced with test_CvCvIntersector.h in the intersections module and the two attached curves with aepsge=1e-10.
isoparametric_error_curves.zip